Why do you think red crosses were the emblem of choice for crusading knights?

The red cross that the Templars wore on their robes was a symbol of martyrdom

a) hostility to or prejudice against jews.

b) the holocaust, also referred to as the shoah, was a genocide during world war ii in which nazi germany, aided by its collaborators, systematically murdered approximately 6 million european jews             , around two-thirds of the jewish population of europe, between 1941 and 1945.

this is a good question! i'll do some research and come back when i have the answer!